For scientists of every age it is a nice booklet with concise descriptions of 100's of scientists from the Greeks onwards. a short description in their kin history, whilst born and died is by way of all you must recognize, approximately their major clinical endeavors. There are few visible omissions yet i need to carry to job the editors for no longer directory possibly the best British chemist of the 19th century - Sir Joseph Wilson Swan (inventor of the electrical gentle bulb; glossy photographic paper and the construction of polymeric fibres).

The current quantity deals twelve stories facing female figures in Gnosticism and Manichaeism. partially One (“Images et symboles”), the writer unveils the hidden that means of a few female figures having performed a job at the legendary scene of these tendencies. a few of these figures, borrowed from different traditions, were deeply remodeled by way of Gnostics or Manichees assuming thereby a brand new value.

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This was not, however, realized at the time and, as a consequence, the determination of a serf-consistent set of atomic weights was < previous page page_23 next page > < previous page page_24 next page > Page 24 delayed for 50 years. The French physicist André Ampere was one of the few who accepted the theory and for many years it was taken to be Ampère's own. Avogadro's contribution to chemisty was not appreciated in his own lifetime. The importance and truth of the theory was unrecognized until 1860 when his fellow Italian.

Wilson was looking for subscribers to his lavishly illustrated American Ornithology (9 vols; 1808-14). By 1820 Audubon had decided to publish his own collection of animals and birds. He spent a further four years traveling through Louisiana and Mississippi shooting specimens. As no American publisher appeared to be interested in his work, Audubon took his paintings to Britain in 1826. He eventually found a printer in Edinburgh willing to work on his 'double elephant size' engravings (39" × 29").

Aston attempted to show why these values are so tantalizingly close to the integral values of Prout why the isotopes of oxygen are not simple 16 and 17 times as massive as the hydrogen atom He argued that the missing mass is in fact, by the mass-energy equivalence of Einstein, not really missing but present as the binding energy of the nucleus. By dividing the missing mass by the mass number and multiplying by 10,000, Aston went on to calculate what was later called the 'packing fraction' and is a measure of the stability of the atom and the amount of energy required to break up or transform the nucleus.